feat: fix Cmd-K shortcut and add exchange full-text search to command palette

- Add missing onOpen prop to CommandPalette (fixes Ctrl+K/Cmd+K)
- Wire server-side exchange search with debounced text query
- Use design system dev snapshot from Gitea registry in CI builds

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/package.json

@@ -14,7 +14,7 @@
     "generate-api:live": "curl -s http://localhost:8081/api/v1/api-docs -o src/api/openapi.json && openapi-typescript src/api/openapi.json -o src/api/schema.d.ts"
   },
   "dependencies": {
-    "@cameleer/design-system": "^0.1.8",
+    "@cameleer/design-system": "^0.0.0-snapshot.20260325.499c86b",
     "@tanstack/react-query": "^5.90.21",
     "openapi-fetch": "^0.17.0",
     "react": "^19.2.4",